JPA与spring整合

1. 三种整合方式：

1. LocalEntityManagerFactoryBean：仅适用于使用JPA进行数据库访问的项目，该配置将根据PersistenceProvider自动检测配置文件进行工作，但是不能设置spring中定义的DataSource，且不支持Spring管理的全局事务（PASS掉）
2. 从JNDI获取：用于从JavaEE服务器只懂得EntityManagerFactory，这种的事务管理要使用JTA
3. LocalContainerEntityManagerFactoryBean：适用于所有环境的FatoryBean，能全面控制EntityManagerFactory配置（推荐）

2. 配置

1. 配置ApplicationContext.xml

   <?xml version="1.0" encoding="UTF-8"?>
   <beans xmlns="http://www.springframework.org/schema/beans"
          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
          xmlns:context="http://www.springframework.org/schema/context" xmlns:tx="http://www.springframework.org/schema/tx"
          xmlns:aop="http://www.springframework.org/schema/aop"
          xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd">
       <context:property-placeholder location="classpath:database.properties"/>
       <context:component-scan base-package="cn.ann"/>
       
       <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
           <property name="driverClass" value="${mysql.driver}"/>
           <property name="jdbcUrl" value="${mysql.url}"/>
           <property name="user" value="${mysql.username}"/>
           <property name="password" value="${mysql.password}"/>
       </bean>
   
       <bean id="entityManagerFactory" 
             class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
           <property name="dataSource" ref="dataSource"/>
           <!-- 配置JPA提供商适配器，可以通过内部 bean 的方式来配置 -->
           <property name="jpaVendorAdapter">
               <bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter"/>
           </property>
           <!-- 配置实体类所在的包 -->
           <property name="packagesToScan" value="cn.ann.entity"/>
           <!-- 配置JPA基本属性，例如JPA实现产品的属性 -->
           <property name="jpaProperties">
               <props>
                   <!-- 配置orm基本属性 -->
                   <prop key="hibernate.dialect">org.hibernate.dialect.MySQL5Dialect</prop>
                   <prop key="hibernate.hbm2ddl.auto">update</prop>
                   <prop key="hibernate.show_sql">true</prop>
                   <prop key="hibernate.format_sql">true</prop>
                   <!-- 二级缓存相关 -->
                   <prop key="hibernate.cache.use_second_level_cache">true</prop>
                   <prop key="hibernate.cache.region.factory_class">
                       org.hibernate.cache.ehcache.EhCacheRegionFactory
                   </prop>
                   <prop key="hibernate.cache.use_query_cache">true</prop>
               </props>
           </property>
       </bean>
   
       <!-- 配置事务 -->
       <bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager">
           <property name="entityManagerFactory" ref="entityManagerFactory"/>
       </bean>
       <tx:advice id="txAdvice">
           <tx:attributes>
               <tx:method name="*"/>
               <tx:method name="get*" propagation="SUPPORTS" read-only="true"/>
               <tx:method name="find*" propagation="SUPPORTS" read-only="true"/>
           </tx:attributes>
       </tx:advice>
   
       <!-- 配置事务到切面 -->
       <aop:config>
           <aop:pointcut id="txPc" expression="execution(* cn.ann.service..*.*(..))"/>
           <aop:advisor advice-ref="txAdvice" pointcut-ref="txPc"/>
       </aop:config>
   </beans>
   

2. 其他配置文件

   • database.properties

     mysql.driver=com.mysql.cj.jdbc.Driver
     mysql.url=jdbc:mysql://localhost:3307/jpa_test?serverTimezone=Asia/Shanghai
     mysql.username=root
     mysql.password=password
     

   • ehcache.xml

     <?xml version="1.0" encoding="UTF-8"?>
     <ehcache xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
              xsi:noNamespaceSchemaLocation="http://ehcache.org/ehcache.xsd"
              updateCheck="false">
         <diskStore path="D:\\temp"/>
         <defaultCache
                 maxElementsInMemory="10000"
                 eternal="false"
                 timeToIdleSeconds="120"
                 timeToLiveSeconds="120"
                 overflowToDisk="true"/>
     </ehcache>
     

   • log4j.properties

     log4j.rootLogger=ERROR, stdout
     log4j.appender.stdout=org.apache.log4j.ConsoleAppender
     log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
     log4j.appender.stdout.layout.ConversionPattern=%d %p [%c] - %m%n
     

3. 测试

1. 通过 @PersistenceContext 可以获取当前事务绑定的EntityManager对象

   @PersistenceContext
   private EntityManager entityManager;
   

2. 测试

   @RunWith(SpringJUnit4ClassRunner.class)
   @ContextConfiguration(locations = "classpath:applicationContext.xml")
   public class Demo {
       @Resource(name = "personService")
       private PersonService personService;
   
       @Test
       public void test01() {
           Person person = new Person();
           person.setName("p1");
           personService.save(person);
       }
   }
   

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